Question

我正在为C ++游戏做功课，这是我们从CO SCI 136类开始要做的，并且说明中指出：

修改作业4问题1解决方案：

用动态数组替换数组
从文件中读取获胜分数M
从文件中读取玩家人数N
从文件中读取播放器名称。

我正在使用Visual Studio 2017，并且遇到以下错误：

Error   C2664   'void Player::setName(std::string &)': cannot convert argument 1 from 'const std::string' to 'std::string &'    player.cpp  7   
Error   C2511   'void Player::setName(const std::string &)': overloaded member function not found in 'Player'   player.cpp  18  
Error   C2597   illegal reference to non-static member 'Player::name'   player.cpp  19

有什么办法可以解决这些错误？

这是我的密码

player.h

#pragma once
#include <string>
using namespace std;

class Player
{
private:
    string name;
    int points;
    bool skipturn = false;

public:
    Player(const string& new_name = "No Name");
    string getName() const;
    int getPoints() const;
    void setName(string& new_name);
    void setPoints(int new_points);
    void setLossHalfPoints();
    void setSkipTurn(bool isSkip);
    bool isSkipTurn();
};

player.cpp

#include <string>
using namespace std;
#include "player.h"

Player::Player(const string& new_name)
{
    setName(new_name);
}
string Player::getName() const
{
    return name;
}
int Player::getPoints() const
{
    return points;
}
void Player::setName(const string& new_name)
{
    name = new_name;
}
void Player::setPoints(int new_points)
{
    points = new_points;
}

void Player::setLossHalfPoints()
{
    this->points /= 2;
}

void Player::setSkipTurn(bool isSkip)
{
    this->skipturn = isSkip;
}

bool Player::isSkipTurn()
{
    return this->skipturn;
}

source.cpp

#include "stdafx.h"
#include <iostream>
#include <string>
#include <ctime>
#include <iomanip>
#include <random>
#include<fstream>
#include "player.h"
using namespace std;

int main()
{
    int M;
    int N;

    Player *player; //Declaring as a dynamic array
    player = new Player[N];
    string *names;
    names = new string[N];
    ifstream file, file1, file2; //opening the file in read mode
    string line;
    file.open("Mdata.dat");
    file >> M; //Reading the M data from the file
    file.close();
    file1.open("Ndata.dat");
    file1 >> N; //Reading the N data from the file
    file1.close();

    file2.open("names.dat");
    if (file2.is_open()) //if the file is open
    {
        while (!file2.eof()) //while the end of file is NOT reached
        {
            getline(file2, line); //get one line from the file
            for (int i = 0; i<N; i++)
            {
                names[i] = line; //reading names from file into names array
            }
        }
        file2.close();
    }

    for (int i = 0; i < N; i++) //setting the player names from names array
    {
        player[i].setName(names[i]); player[i].setPoints(0);
    }

    default_random_engine dre(17890714);
    uniform_int_distribution<int> player_uid(0, N - 1);
    uniform_int_distribution<int> dice_uid(1, 6);
    int index = player_uid(dre);
    do
    {
        index = (index + 1) % N;//implements circular array
        if (player[index].isSkipTurn())
        {
            cout << player[index].getName() << '/' << setw(2) << "skip turn" << endl;
            player[index].setSkipTurn(false);// clear skip turn
            index = (index + 1) % N;//implements circular array
        }
        int die1 = dice_uid(dre);
        int die2 = dice_uid(dre);
        int points = player[index].getPoints();
        player[index].setPoints(points + die1 + die2);
        if (player[index].getPoints() > M)
        {
            player[index].setLossHalfPoints();// set half of then points
            player[index].setSkipTurn(true);// set skip turn   
            cout << player[index].getName() << '/' << setw(2) << player[index].getPoints() << '/' << setw(2) << player[index].getPoints() * 2 << endl;
        }
        else {
            cout << player[index].getName() << '/' << setw(2) << die1 + die2 << '/' << setw(2) << player[index].getPoints() << endl;
        }
    } while (player[index].getPoints() != M);
    cout << player[index].getName() << " wins" << endl;

    system("pause");
    return 0;
}

Answer 1

让我们看看编译器错误。

Error C2664 'void Player::setName(std::string &)': cannot convert argument 1 from 'const std::string' to 'std::string &' player.cpp 7

有人抱怨说，在player.cpp的第7行调用const std::string函数时，无法将std::string转换为setName()。但是我们在播放器类中有一个setName函数，对吗？怎么了？

如果您在Player.h中更仔细地查看它，则函数setName的声明将缺少const属性。

void setName(string& new_name);

如果您将const添加到此文件中即可解决该问题。

C ++中具有动态数组的简单竞赛游戏

1 个答案: